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Restricted Stock Units - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs)
shares in Thousands
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Restricted Stock Units, Number of Shares [Roll Forward]  
Unvested restricted shares/units outstanding, beginning (in shares) | shares 3,196
Granted, restricted shares/units (in shares) | shares 0
Vested, restricted shares/units (in shares) | shares (724)
Forfeited, restricted shares/units (in shares) | shares (85)
Unvested restricted shares/units outstanding, ending (in shares) | shares 2,387
Restricted Stock Units, Weighted Average Grant Price [Roll Forward]  
Unvested restricted shares/units, weighted average grant price, beginning (in dollars per share) | $ / shares $ 0.62
Granted, weighted average grant price (in dollars per share) | $ / shares 0.00
Vested, weighted average grant price (in dollars per share) | $ / shares 0.42
Forfeited, weighted average grant price (in dollars per share) | $ / shares 0.61
Unvested restricted shares/units, weighted average grant price, ending (in dollars per share) | $ / shares $ 0.68